#pragma once
#include<stdio.h>
#include<assert.h>
#include<stdlib.h>
typedef struct tree
{
	int val;
	struct tree* left;
	struct tree* right;
}tree;


void push(tree** root, int x);
tree* find(tree* root, int x);
void del(tree** root, int x);
void print(tree* root);
